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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee331640c98203960e0e6a15c326a6d94fa36a529c8fdac38406bf33a4b2771' 
  AND token = 'iT+3XJViMJZhFm1pAPqpLpyP3kE2yIg2hX43vPvJp8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}